package cc.eddic.practice.spring.webapi;

import cc.eddic.practice.spring.domain.SubCategory;
import cc.eddic.practice.spring.dto.CategoryAddRequest;
import cc.eddic.practice.spring.dto.CategoryResponse;
import cc.eddic.practice.spring.dto.SubCategoryAddRequest;
import cc.eddic.practice.spring.dto.SubCategoryResponse;
import cc.eddic.practice.spring.repository.CategoryRepository;
import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.springframework.http.HttpEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import javax.transaction.Transactional;
import java.util.Comparator;
import java.util.NoSuchElementException;
import java.util.stream.Collectors;

@Slf4j
@RestController
@RequestMapping("/api/categories")
public class CategoryController {

    @PostMapping
    public HttpEntity<?> add(@RequestBody final CategoryAddRequest model) {
        val category = categoryRepository.save(model.as());
        return ResponseEntity.created(ServletUriComponentsBuilder.fromCurrentRequest()
                .path("/{id}").buildAndExpand(category.getId()).toUri()).build();
    }

    @GetMapping("/{id}")
    public HttpEntity<CategoryResponse> get(@PathVariable("id") final long id) {
        if (log.isDebugEnabled()) log.debug("id = {}", id);
        val category = categoryRepository.findById(id).orElseThrow(NoSuchElementException::new);
        return ResponseEntity.ok(CategoryResponse.from(category));
    }

    @Transactional
    @PostMapping("/{categoryId}/subcategories")
    public HttpEntity<?> add(@PathVariable("categoryId") Long categoryId, @RequestBody final SubCategoryAddRequest model) {
        val category = categoryRepository.findById(categoryId).orElseThrow(NoSuchElementException::new);
        val subCategory = model.as();
        category.add(subCategory);
        categoryRepository.save(category);

        return ResponseEntity.ok().build();

//        val id = category.getSubCategories().stream()
//                .filter(x -> x.getName().equals(model.getName()))
//                .sorted(Comparator.comparing(SubCategory::getCreatedOn).reversed())
//                .map(SubCategory::getId)
//                .findFirst().orElse(-1L);
//        if (log.isDebugEnabled()) {
//            log.debug("sub category id {}", subCategory.getId());
//            log.debug("(filter) sub category id {}", id);
//        }
//        return ResponseEntity.created(ServletUriComponentsBuilder.fromCurrentRequest().path("/{subCategoryId}").buildAndExpand(id).toUri()).build();
    }

    @GetMapping("/{categoryId}/subcategories")
    public HttpEntity<?> get(@PathVariable("categoryId") Long categoryId) {
        if (log.isDebugEnabled()) log.debug("categoryId = {}", categoryId);
        val category = categoryRepository.findById(categoryId).orElseThrow(NoSuchElementException::new);
        if (log.isDebugEnabled()) log.debug("run lazy load");
        return ResponseEntity.ok(category.getSubCategories().stream().map(SubCategoryResponse::from).collect(Collectors.toList()));
    }

    @GetMapping("/{categoryId}/subcategories/{subCategoryId}")
    public HttpEntity<?> get(@PathVariable("categoryId") Long categoryId, @PathVariable("subCategoryId") Long subCategoryId) {
        if (log.isDebugEnabled()) log.debug("categoryId = {}, subCategoryId = {}", categoryId, subCategoryId);
        val category = categoryRepository.findById(categoryId).orElseThrow(NoSuchElementException::new);
        val subcategory = category.getSubCategories().stream().filter(subCategory -> subCategory.getId().equals(subCategoryId)).findFirst().orElseThrow(NoSuchElementException::new);
        return ResponseEntity.ok(SubCategoryResponse.from(subcategory));
    }

    public CategoryController(CategoryRepository categoryRepository) {
        this.categoryRepository = categoryRepository;
    }

    private final CategoryRepository categoryRepository;
}
